Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b10c6ab89de997e…

MALICIOUS

PDF

83.2 KB Created: 2021-03-18 06:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f35fdc9ff258002db2c606011a04e418 SHA-1: 10a67da4c1cf5e218aea2d1bb9bd41f24e56d682 SHA-256: 8b10c6ab89de997e53a14fcfd830a324bddfea6c8ace0efbc2232b9abd2d9d4e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a malicious link farm, containing numerous external links to potentially untrusted domains, including 'mezovuduw.ru' and 'relax35.ru'. The presence of a 'download button' heuristic and the ML classifier's high confidence score further indicate malicious intent. The document's content, though heavily obfuscated, appears to be a lure related to video songs, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/123?utm_term=alaipayuthey+tamil+movie+video+songs PDF link annotation
    • http://relax35.ru/62713837343mniau.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/nenolaw.pdfIn PDF document text
    • https://vorevowupi.weebly.com/uploads/1/3/4/6/134633589/4a4ede4dbef563.pdfIn PDF document text
    • https://pulatufulufu.weebly.com/uploads/1/3/4/6/134610330/d91cb1ce1ec7f.pdfIn PDF document text
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/ketuzobesejiw.pdfIn PDF document text
    • https://piwirajaluz.weebly.com/uploads/1/3/5/3/135312697/c633c5.pdfIn PDF document text
    • https://pafasuletelaw.weebly.com/uploads/1/3/4/4/134447528/fc77738315a.pdfIn PDF document text
    • http://ionatr.space/how_to_use_elite_platinum_air_fryerh959d.pdfIn PDF document text
    • http://suziterunedoloj.sportsontheweb.net/astrology_manual.pdfIn PDF document text
    • http://ferabugajefelam.mypressonline.com/26517239002.pdfIn PDF document text
    • http://garderob-podolsk.ru/sazagidorus1qzpc.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/6259897875.pdfIn PDF document text
    • http://ig-copyrightnoticehelp.com/fubumofasegomapiil823.pdfIn PDF document text
    • http://pinezotamex.getenjoyment.net/39417815259.pdfIn PDF document text
    • https://lamegebepezaris.weebly.com/uploads/1/3/1/4/131438642/3795492.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_81d152409cc14f30a3280040478fdee6.pdf?index=trueIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_7927fe017be24316ba1d4e063fdfeb29.pdf?index=trueIn PDF document text
    • https://828c6a01-da61-4814-986a-f72e64f4f334.filesusr.com/ugd/cdfdba_4c4f198814094e0eb437480d8b59cf05.pdf?index=trueIn PDF document text
    • https://f8d4b294-f952-4a11-85e8-0a3036f9bdaf.filesusr.com/ugd/ad8f3a_6e59f6e0992f412b848b5bef750fe4a5.pdf?index=trueIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_a03e564895234ea2b5af1d73567f6c72.pdf?index=trueIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_5093741363d54081a347e511beafaddd.pdf?index=trueIn PDF document text
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_4a1a0dbbf7814198bf6e54781efd1366.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_c20f556ecde04972a1b58e5c22ae5de1.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE468 3456 bytes
SHA-256: 4ffd3317d194e5fae449cab0849e9d3bf4efef032b826265cdab18df16873ff0
font_01_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 5428 bytes
SHA-256: 097a4c3a01b166afc2f64bafde74b395335d7b47cbd2c0618cd7cbde1b2935f4
font_02_sfnt_off0001032f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032F 11052 bytes
SHA-256: a860c812d73691a9920e65802608b56adf2b3a14f6a6bce6da20a05849b74da1
font_03_sfnt_off0001292a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 16132 bytes
SHA-256: 6c511cd2548aab1566dad8f54fccf2be4cd056cf5a4d5d56937977fde9165995

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